Successfully complete the indicated task to unlock the corresponding achievement.
Achievement | How to unlock
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Been There, Done Bad | Seen the true bad ending.
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Brothers in Arms | Seen the Amamiya brothers ending.
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Murder Sea Wrote | Seen Yukinari's ending.
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Seen Too Much | Unlocked all CGs.
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Seventeen Again | Seen the secret ending.
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Short End of the Stick | Seen Chiaki's ending.
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Significant Brother | Seen Natsume's ending.
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Star-Crossed Brothers | Seen Masaharu's ending.
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Trial and Error | Found and used all mementos.
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